Screw locking



Patented l, 1938 l SCREW LOCKING Johann Meersteine'r, Saal, Olechoslovalda, aissignor to the rm Bechert & Co., Drahtstifte,

Schranbenund Stahlindustrie-Akticngesellschai't, Saaz, Clechoslovakia' Applieesen December 1s, 193.5, serial Ne. 54,515

In Czechoslovakia December 22, 1934 s claims. (ci. isi-14)" 'I'his invention relates'to screw locking means and the method of application thereof. One advantage of the invention is the provision of means whereby such articles as annut and bolt,

or a bolt to be screwed into a threaded socket, can be locked together by the mere application of ordinary tightening up in such a way as to render them unaiected by vibration.v Another advantage is the provision 'of locking lmeans which will remain effective even after repeated tightenings up of the screwed elements. Yet another advantage is the fact that the locking means 'can be provided either externally or on the internally threadedco-operating parts. With the above and other objects in. view, the invention consists in the provision between threads which are 'to interengage, of a helical length of hard wire o r the' like, preferably provided With a cutting edge, and adapted to be positioned in thegroove of a thread or threads and upon tightening up to deform, cut or jam the projecting part of the complementary thread. The invention is illustrated diagrammatically inA the accompanying drawing, which is a section lthrough a nut and bolt for. the purpose of example. In this -drawing the bolt I has an ordi- -nary or normal thread with land '2 and groove 3,

of course helically disposed.v The nut l likewisel has an ordinary or normal thread having land ,'30 5 and groove 6. The crest i. e. top surface or edge that joins the two sidesof the thread is shown as deformed by the wire 1 located between the crest and thevroot, i. e. the bottom of the space `between the threads, and opposed to both the crest and the root.

In the groove 3 of the bolt there is wound or applied a helix of hard Wire 'l which in the preferredA form sho-wn is of parallelogram" section,

preferably so shaped that itshinner apex iits into 40 thegroove 3 of the bolt (andthis groove may, over the'material part oi the-length of the bolt, be suitablyformed to this end) and its external edge likewise presenting a relatively sharp cutting profile, as can be seen at 1A. The acute V-form oi.' the groove l need not be initially applied to the bolt, but may b e the result oi cutting action o f the wire 'I upon tightening up, as is well illustrated by the position of the wire .1 in the bottom turn oi the thread, represented at 3A.

The method of use of this device is simply to tighten the nut on to the'bolt,` whereupon the;

- wire 1 ,cuts the land-I of the nut and deforms the land (as indicated for example at IA), in such a manner as to'lock the nut on the bolt as a resistance againstall ordinary. dltllrbnei tuch as vibration.

It will beobvious that the wire'l or'one like it, may'be provided in the groove 6 of thenut if desired, .and it will then correspondingly cut or deform the land 2 of the bolt. It will alsol be .clear that the wire may be madein various forms, 5 either merely to deform the land with which it ments having complementary threads, and a l5 hard wire helix interposed between the threads when engaged, located in the groove of one and facing the land of the other, and presenting to the latter a longitudinally extended edge having a profile adapting itA to cut or deform the land on relative rotation of the threaded elements.

- 3. Screw locking means as set forth in claim 2 having the wire helix of such cross-sectional contour as to render its opposite longitudinal edges, presented respectively to the groove of 25 one thread and 'to the land of the other, cutting or deforming on relative rotation of the-threaded elements.

4. For locking screw-threaded members such as a nut and bolt, the provision of a hard wire 30 helix in the grooves of the thread of the bolt member, the wire having edges to bear against and cause deformation of the groove in which it lies, and the land of the thread of the complementary member, such that locking is eected 35 by deformation due to the wire upon tightening up.

5. ,For locking lscrevjv-threaded members such as a nutand bolt, the provision of a hard wire Y helix 1n the grooves ofthe thread er the bolt 40 member, the wire helix being of hard wire of four-sided cross-section and having edges to bear against and cause defamation of the groove in which it lies and the land .of the thread, oi the complementary member,l such that locking iss effected by deformation dueto the wire 'upon tightening up.

r6.'S'crew locking means comprising a normally threaded -bolt and nut with complemenmy threads, end e third and here element eddi- 5- tional to said threadsinterposed between the threads of said respective members, located in the groove loi' one, and facing the root of one and the crest ot the other for locking the parte -together on relative rotation of the nut and bolt. i 5- e Jonsrm CERTIFICATE .oF coRREcTIoN. .Patent-,Nm 2,109 ,778; March l,` 1958.

JOHANN MEERSTEINER.

Itis hereby certified that the abo-ve numbered patent was erroneouslj vissued to "Bechert 8 Co. Drahtstifte,` Schrauben- -und Stah1industr:.e

Aktiengesellschaft" as' assignee of the entire interest in said invention, whereassaid Letters Patent should have been issued to the inventor, said Meersteiner and Bechert 8c. Co., Drahtstifte, Schraubenund Stahlindustrie-Aktiengesellschaft of Saaz', Czechoslovakia, saidfilgm` being assignee vof'one-hxail'f interest only in'said-invention, as shown by the record of assignments inthis office; .and that the said Letters Patent should be read with'this correotion therein that the same m'ay vconform' to the record ofthe oase in the Patent Office.l

Signet-1 and sealed this 19th day of April, A. D. 1958.

A n l Y .(seal) rActing Commissioner fof`- Patents. 

